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Zhu C, Li J, Liu Y, Jin F, Wang Z, Tong Y, Qin J, Fang B. Genomic analysis and characterization of bacteriophage vB_SpuS_NX263 infecting Salmonella enterica subsp. enterica serovar Pullorum. Arch Virol 2023; 168:216. [PMID: 37525023 DOI: 10.1007/s00705-023-05841-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 06/20/2023] [Indexed: 08/02/2023]
Abstract
In this study, a new Salmonella phage, NX263, was isolated from sewage. This phage could lyse 90.57% (48/53) of the bacterial strains tested and showed good activity over a wide range of temperature (up to 60°C) and pH (5-10). Phylogenetic analysis showed that it should be classified as a member of the genus Skatevirus. The genome of phage NX263 is 46,574 bp in length with a GC content of 45.52%. It contains 89 open reading frames and two tRNA genes. No lysogeny, drug resistance, or virulence-associated genes were identified in the genome sequence, suggesting that this phage could potentially be used to treat Salmonella Pullorum infections.
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Affiliation(s)
- Chunyang Zhu
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China
| | - Jing Li
- Beijing Advanced Innovation Centre for Soft Matter Science and Engineering (BAIC-SM), College of Life Science and Technology, Beijing University of Chemical Technology, 100029, Beijing, China
| | - Yang Liu
- Wen's Foodstuffs Group Co., Ltd, Yunfu, 527439, China
| | - Fenhua Jin
- Guangdong Wens Dahuanong Biotechnology Co., Ltd, 527400, Yunfu, China
| | - Zhanxin Wang
- Wen's Foodstuffs Group Co., Ltd, Yunfu, 527439, China
| | - Yigang Tong
- Beijing Advanced Innovation Centre for Soft Matter Science and Engineering (BAIC-SM), College of Life Science and Technology, Beijing University of Chemical Technology, 100029, Beijing, China
| | - Jianping Qin
- Wen's Foodstuffs Group Co., Ltd, Yunfu, 527439, China.
| | - Binghu Fang
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China.
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China.
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2
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Sattar S, Bailie M, Yaqoob A, Khanum S, Fatima K, Altaf AURB, Ahmed I, Shah STA, Munawar J, Zehra QA, Daud S, Arshad A, Imdad K, Javed S, Tariq A, Bostan N, Altermann E. Characterization of two novel lytic bacteriophages having lysis potential against MDR avian pathogenic Escherichia coli strains of zoonotic potential. Sci Rep 2023; 13:10043. [PMID: 37340022 DOI: 10.1038/s41598-023-37176-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Accepted: 06/17/2023] [Indexed: 06/22/2023] Open
Abstract
Avian pathogenic E. coli (APEC) is associated with local and systemic infections in poultry, ducks, turkeys, and many other avian species, leading to heavy economical losses. These APEC strains are presumed to possess zoonotic potential due to common virulence markers that can cause urinary tract infections in humans. The prophylactic use of antibiotics in the poultry sector has led to the rapid emergence of Multiple Drug Resistant (MDR) APEC strains that act as reservoirs and put human populations at risk. This calls for consideration of alternative strategies to decrease the bacterial load. Here, we report isolation, preliminary characterization, and genome analysis of two novel lytic phage species (Escherichia phage SKA49 and Escherichia phage SKA64) against MDR strain of APEC, QZJM25. Both phages were able to keep QZJM25 growth significantly less than the untreated bacterial control for approximately 18 h. The host range was tested against Escherichia coli strains of poultry and human UTI infections. SKA49 had a broader host range in contrast to SKA64. Both phages were stable at 37 °C only. Their genome analysis indicated their safety as no recombination, integration and host virulence genes were identified. Both these phages can be good candidates for control of APEC strains based on their lysis potential.
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Affiliation(s)
- Sadia Sattar
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan.
| | - Marc Bailie
- AgResearch, Palmerston North, 4410, New Zealand
| | - Akasha Yaqoob
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | | | - Kaniz Fatima
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Anees Ur Rehman Bin Altaf
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Ibrar Ahmed
- Alpha Genomics Private Limited, Islamabad, 45710, Pakistan
| | - Syed Tahir Abbas Shah
- Functional Genomics Lab, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Javeria Munawar
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Quaratul Ain Zehra
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Sajeela Daud
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Ayesha Arshad
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Kaleem Imdad
- Microbiology and Immunology Lab, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Sundus Javed
- Microbiology and Immunology Lab, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Amira Tariq
- Microbiology and Immunology Lab, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Nazish Bostan
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad, 45550, Pakistan
| | - Eric Altermann
- School of Veterinary Science Massey University Centre for Bioparticle Applications, Massey University, Palmerston North, 4472, New Zealand
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Baskaran V, Karthik L. Phages for treatment of Salmonella spp infection. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2023; 200:241-273. [PMID: 37739557 DOI: 10.1016/bs.pmbts.2023.03.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
Salmonella, is one of the bacterial genera having more than 2500 serogroups is one of the most prominent food borne pathogen that is capable of causing disease out breaks among humans and animals. Recent reports clearly shows that this pathogen is evolved and it developed drug resistant towards most of the commercially available antibiotics. In order to overcome this emerging resistance, Bacteriophage therapy is one of the alternative solutions. It is more pathogen specific, high potency, and thereby highly safe for consumption. This chapter discuss about Rapid screening and Detection Methods Associated with Bacteriophage for Salmonella, commercially available phage products and regulatory status, Salmonella endolysins and future prospects of phage therapy.
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Affiliation(s)
- V Baskaran
- R and D, Salem Microbes Private Limited, Salem, Tamil Nadu, India
| | - L Karthik
- R and D, Salem Microbes Private Limited, Salem, Tamil Nadu, India.
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Zaki BM, Mohamed AA, Dawoud A, Essam K, Hammouda ZK, Abdelsattar AS, El-Shibiny A. Isolation, screening and characterization of phage. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2023; 200:13-60. [PMID: 37739553 DOI: 10.1016/bs.pmbts.2023.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
Bacterial resistance threatens public health due to a lack of novel antibacterial classes since the 21st century. Bacteriophages, the most ubiquitous microorganism on Earth and natural predators of bacteria, have the potential to save the world from the post-antibiotic era. Therefore, phage isolation and characterization are in high demand to find suitable phages for therapeutic and bacterial control applications. The chapter presents brief guidance supported by recommendations on the isolation of phages, and initial screening of phage antimicrobial efficacy, in addition to, conducting comprehensive characterization addressing morphological, biological, genomic, and taxonomic features.
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Affiliation(s)
- Bishoy Maher Zaki
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza, Egypt; Microbiology and Immunology Department, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), Giza, Egypt
| | - Amira A Mohamed
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza, Egypt
| | - Alyaa Dawoud
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza, Egypt; Biochemistry Department, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo, Egypt
| | - Kareem Essam
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza, Egypt
| | - Zainab K Hammouda
- Microbiology and Immunology Department, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), Giza, Egypt
| | - Abdallah S Abdelsattar
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza, Egypt
| | - Ayman El-Shibiny
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza, Egypt; Faculty of Environmental Agricultural Sciences, Arish University, Arish, Egypt
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Astudillo-Riera F, Astudillo-Vallejo K, Gómez-Asanza ML, Pacha-Aguilar LA, Vallecillo-Maza AJ, Rivera-Pirela SE. Caracterización fenotípica y molecular de colifagos de granjas de pollos de engorde con Colibacilosis y plantas beneficiadoras de aves en Azuay, Ecuador. REVISTA CIENTÍFICA DE LA FACULTAD DE CIENCIAS VETERINARIAS 2023. [DOI: 10.52973/rcfcv-e33211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
La Escherichia coli patógena extraintestinal, denominada E. coli patógena aviar, posee atributos de virulencia específicos que causan infecciones invasivas en aves de corral, responsables de la Colibacilosis aviar. Los veterinarios tienen opciones restringidas de agentes antimicrobianos para su tratamiento, debido a problemas de resistencia bacteriana de la E. coli, que incide indirectamente en la salud humana. Como alternativa se plantea el uso de bacteriófagos con poder bacteriolítico específico contra bacterias enteropatógenas. El objetivo de este estudio fue el de caracterizar bacteriófagos líticos específicos para E. coli (colifagos) como una alternativa de biocontrol contra la colibacilosis aviar, determinando su especificidad frente a E. coli enteropatógenas aisladas de la zona, su capacidad lítica, fenotipo y genotipo. Para ello se recolectaron muestras ambientales de plantas beneficiadoras avícolas y de aguas residuales en granjas de producción con problemas de colibacilosis. Se procedió al aislamiento de bacteriófagos con actividad lítica aparente frente a E. coli TOP10F´ y sobre los aislados de E. coli patógenas previamente caracterizadas de la zona. Un total de 36 aislados de colifagos líticos fueron enfrentados a 10 cepas patógenas de E. coli. De éstos, 22 fagos afectaron entre el 10–50 % de las cepas evaluadas, 5 fagos infectaron entre el 60 y 70 % y solo 9 fagos no mostraron capacidad lítica frente a las cepas patógenas de E. coli. Los fagos con capacidad lítica más alta fueron seleccionados y caracterizados genotípicamente mediante la técnica de fragmentos de restricción de longitud polimórfica (RFLP), posterior a su tratamiento con enzimas de restricción: BamHI, EcoRI, EcoRV y Hind III. Como resultado se obtuvieron 4 colifagos con diferentes patrones de banda. Se concluye que, en muestras ambientales de granjas avícolas diagnosticadas de colibacilosis, se pueden aislar una gran variedad de colifagos con potencial lítico para el biocontrol de E. coli patógena.
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Affiliation(s)
- Fabián Astudillo-Riera
- Universidad de Cuenca, Facultad de Ciencias Agropecuarias, Escuela de Medicina Veterinaria y Zootecnia. Cuenca, Ecuador - Universidad de Zulia, Facultad de Ciencias Veterinarias. Maracaibo, Venezuela
| | - Kevin Astudillo-Vallejo
- Universidad de Cuenca, Facultad de Ciencias Agropecuarias, Escuela de Medicina Veterinaria y Zootecnia. Cuenca, Ecuador
| | - Maria Laura Gómez-Asanza
- Universidad de Cuenca, Facultad de Ciencias Agropecuarias, Escuela de Medicina Veterinaria y Zootecnia. Cuenca, Ecuador
| | - Luis Armando Pacha-Aguilar
- Universidad de Cuenca, Facultad de Ciencias Agropecuarias, Escuela de Medicina Veterinaria y Zootecnia. Cuenca, Ecuador
| | - Antonio Javier Vallecillo-Maza
- Universidad de Cuenca, Facultad de Ciencias Agropecuarias, Escuela de Medicina Veterinaria y Zootecnia. Cuenca, Ecuador - Universidad de Cuenca, Facultad de Ciencias Agropecuarias, Laboratorio de Biología Molecular. Cuenca, Ecuador
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Phenotypic Characterization and Comparative Genomic Analysis of Novel Salmonella Bacteriophages Isolated from a Tropical Rainforest. Int J Mol Sci 2023; 24:ijms24043678. [PMID: 36835084 PMCID: PMC9963771 DOI: 10.3390/ijms24043678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 02/03/2023] [Accepted: 02/09/2023] [Indexed: 02/17/2023] Open
Abstract
Salmonella infections across the globe are becoming more challenging to control due to the emergence of multidrug-resistant (MDR) strains. Lytic phages may be suitable alternatives for treating these multidrug-resistant Salmonella infections. Most Salmonella phages to date were collected from human-impacted environments. To further explore the Salmonella phage space, and to potentially identify phages with novel characteristics, we characterized Salmonella-specific phages isolated from the Penang National Park, a conserved rainforest. Four phages with a broad lytic spectrum (kills >5 Salmonella serovars) were further characterized; they have isometric heads and cone-shaped tails, and genomes of ~39,900 bp, encoding 49 CDSs. As the genomes share a <95% sequence similarity to known genomes, the phages were classified as a new species within the genus Kayfunavirus. Interestingly, the phages displayed obvious differences in their lytic spectrum and pH stability, despite having a high sequence similarity (~99% ANI). Subsequent analysis revealed that the phages differed in the nucleotide sequence in the tail spike proteins, tail tubular proteins, and portal proteins, suggesting that the SNPs were responsible for their differing phenotypes. Our findings highlight the diversity of novel Salmonella bacteriophages from rainforest regions, which can be explored as an antimicrobial agent against MDR-Salmonella strains.
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Kar P, Das TK, Ghosh S, Pradhan S, Chakrabarti S, Mondal KC, Ghosh K. Characterization of a Vibrio-infecting bacteriophage, VPMCC5, and proposal of its incorporation as a new genus in the Zobellviridae family. Virus Res 2022; 321:198904. [PMID: 36044930 DOI: 10.1016/j.virusres.2022.198904] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 08/24/2022] [Accepted: 08/26/2022] [Indexed: 12/24/2022]
Abstract
Vibrio harveyi is a Gram-negative pathogenic bacterium responsible for luminous vibriosis in shrimp and causes mass mortality of shrimp that leads to economic losses. Considering the emergence of multi-drug resistant bacteria, there is always a need for an alternative to antibiotics. In this study, we have aimed to characterize the Vibrio-infecting bacteriophage VPMCC5 (isolated from an environmental sample by using V. harveyi S2A) and evaluate its efficacy in controlling the pathogen. The bacteriophage exhibited an isometric head and short non-contractile tail. The latent period of the bacteriophage was 10 min and the burst size was 20. The genome of the bacteriophage was 48938 bp long with 40.7 mol% G+C content. A total of 71 ORFs were identified and no tRNA and antibiotic-associated genes were detected. Comparative genomic analyses (CLANS, dot plot, progressiveMauve alignment, and phylogenetic tree) strongly suggest that the bacteriophage VPMCC5 might be a new genus in the family of Zobellviridae. A distinguishing feature of this bacteriophage among the other reported Vibrio-infecting bacteriophages is the presence of putative alginate lyase family protein-coding open reading frame. The bacteriophage was found to be surviving at pH 3-9 and in a wide range of temperatures (4-45 ᵒC). In liquid culture inhibition, the bacteriophage could completely lyse the host bacteria after 3 h. This bacteriophage might be used as a biocontrol agent in the extreme environment of shrimp culture.
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Affiliation(s)
- Priyanka Kar
- Department of Biological Sciences, Midnapore City College, Midnapore, West Bengal 721129, India
| | - Tridip Kr Das
- Department of Biological Sciences, Midnapore City College, Midnapore, West Bengal 721129, India
| | - Smita Ghosh
- Department of Biological Sciences, Midnapore City College, Midnapore, West Bengal 721129, India
| | - Shrabani Pradhan
- Department of Biological Sciences, Midnapore City College, Midnapore, West Bengal 721129, India
| | - Sudipta Chakrabarti
- Department of Biological Sciences, Midnapore City College, Midnapore, West Bengal 721129, India
| | - Keshab Ch Mondal
- Department of Microbiology, Vidyasagar University, West Bengal, India
| | - Kuntal Ghosh
- Department of Biological Sciences, Midnapore City College, Midnapore, West Bengal 721129, India.
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Pelyuntha W, Sanguankiat A, Kovitvadhi A, Vongkamjan K. Broad lytic spectrum of novel Salmonella phages on ciprofloxacin-resistant Salmonella contaminated in the broiler production chain. Vet World 2022; 15:2039-2045. [PMID: 36313854 PMCID: PMC9615508 DOI: 10.14202/vetworld.2022.2039-2045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 07/05/2022] [Indexed: 11/16/2022] Open
Abstract
Background and Aim: Ciprofloxacin (CIP) is recommended for salmonellosis treatment as the drug of choice; however, overuse of this drug can cause drug resistance issues and failure to treat diseases. Phage therapy is an alternative approach for combatting CIP-resistant infection. This study aimed to estimate the prevalence of CIP-resistant Salmonella isolated from the broiler production chain and evaluated the lytic ability of novel Salmonella phages isolated from water samples. Materials and Methods: Samples were obtained from the broiler production chain and used for Salmonella isolation. serovar and CIP resistance of each isolate were characterized through latex agglutination and agar disk diffusion test, respectively. Water samples from different sources were acquired for phage isolation. The lytic activity of novel-isolated phages was also examined. Results: In this study, 51 Salmonella isolates were recovered from the broiler production chain (two commercial farms, one free-range farm, two slaughterhouses, and three stalls from the wet market). Kentucky was the major serovar characterized (16), followed by Typhimurium (9), Agona (5), Corvalis (5), Schwarzengrund (5), Singapore (3), Weltevreden (3), Mbandaka (2), Give (2), and Albany (1). The serovars that exhibited CIP resistance were 14/16 isolates of serovar Kentucky (87.5%) and one isolate of serovar Give (50%), whereas eight other serovars were susceptible to this drug. Overall, the prevalence of CIP-resistant Salmonella recovered from the sources included in this study was 29.4%. This study identified 11 Salmonella phages isolated from wastewater samples derived from broiler farms, wastewater treatment stations, and natural reservoirs. Our phages showed the total percentage of lysis ability ranging from 33.3% to 93.3% against CIP-resistant isolates. However, only one bacterial isolate, namely 210SL, recovered from the food contact surface of a wet market stall and was resistant to all phages. Conclusion: Diverse serovars of Salmonella were recovered in the broiler production chain in this study, while the isolates presenting CIP-resistant Salmonella were as high as 29.4%. Overall, Salmonella phages showed high lysis ability against these CIP-resistant Salmonella isolates, suggesting the potential application of phage-based treatments or biocontrol in the broiler production chain.
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Affiliation(s)
- Wattana Pelyuntha
- Department of Biotechnology, Faculty of Agro-Industry, Kasetsart University, Bangkok, 10900, Thailand
| | - Arsooth Sanguankiat
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Kasetsart University, Kamphaeng Saen, Nakhon Pathom, 73140, Thailand
| | - Attawit Kovitvadhi
- Department of Physiology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok, 10900, Thailand
| | - Kitiya Vongkamjan
- Department of Biotechnology, Faculty of Agro-Industry, Kasetsart University, Bangkok, 10900, Thailand
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Flagellotropic Bacteriophages: Opportunities and Challenges for Antimicrobial Applications. Int J Mol Sci 2022; 23:ijms23137084. [PMID: 35806089 PMCID: PMC9266447 DOI: 10.3390/ijms23137084] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/18/2022] [Accepted: 06/21/2022] [Indexed: 12/22/2022] Open
Abstract
Bacteriophages (phages) are the most abundant biological entities in the biosphere. As viruses that solely infect bacteria, phages have myriad healthcare and agricultural applications including phage therapy and antibacterial treatments in the foodservice industry. Phage therapy has been explored since the turn of the twentieth century but was no longer prioritized following the invention of antibiotics. As we approach a post-antibiotic society, phage therapy research has experienced a significant resurgence for the use of phages against antibiotic-resistant bacteria, a growing concern in modern medicine. Phages are extraordinarily diverse, as are their host receptor targets. Flagellotropic (flagellum-dependent) phages begin their infection cycle by attaching to the flagellum of their motile host, although the later stages of the infection process of most of these phages remain elusive. Flagella are helical appendages required for swimming and swarming motility and are also of great importance for virulence in many pathogenic bacteria of clinical relevance. Not only is bacterial motility itself frequently important for virulence, as it allows pathogenic bacteria to move toward their host and find nutrients more effectively, but flagella can also serve additional functions including mediating bacterial adhesion to surfaces. Flagella are also a potent antigen recognized by the human immune system. Phages utilizing the flagellum for infections are of particular interest due to the unique evolutionary tradeoff they force upon their hosts: by downregulating or abolishing motility to escape infection by a flagellotropic phage, a pathogenic bacterium would also likely attenuate its virulence. This factor may lead to flagellotropic phages becoming especially potent antibacterial agents. This review outlines past, present, and future research of flagellotropic phages, including their molecular mechanisms of infection and potential future applications.
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Phenotypic characterization and genome analysis of a novel Salmonella Typhimurium phage having unique tail fiber genes. Sci Rep 2022; 12:5732. [PMID: 35388062 PMCID: PMC8986868 DOI: 10.1038/s41598-022-09733-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 03/28/2022] [Indexed: 11/25/2022] Open
Abstract
Salmonella enterica serovar Typhimurium is a foodborne pathogen causing occasional outbreaks of enteric infections in humans. Salmonella has one of the largest pools of temperate phages in its genome that possess evolutionary significance for pathogen. In this study, we characterized a novel temperate phage Salmonella phage BIS20 (BIS20) with unique tail fiber genes. It belongs to the subfamily Peduovirinae genus Eganvirus and infects Salmonella Typhimurium strain (SE-BS17; Acc. NO MZ503545) of poultry origin. Phage BIS20 was viable only at biological pH and temperature ranges (pH7 and 37 °C). Despite being temperate BIS20 significantly slowed down the growth of host strain for 24 h as compared to control (P < 0.009). Phage BIS20 features 29,477-base pair (bp) linear DNA genome with 53% GC content and encodes for 37 putative ORFs. These ORFs have mosaic arrangement as indicated by its ORF similarity to various phages and prophages in NCBI. Genome analysis indicates its similarity to Salmonella enterica serovar Senftenberg prophage (SEStP) sequence (Nucleotide similarity 87.7%) and Escherichia virus 186 (~ 82.4% nucleotide similarity). Capsid genes were conserved however those associated with tail fiber formation and assembly were unique to all members of genus Eganvirus. We found strong evidence of recombination hotspot in tail fiber gene. Our study identifies BIS20 as a new species of genus Eganvirus temperate phages as its maximum nucleotide similarity is 82.4% with any phage in NCBI. Our findings may contribute to understanding of origin of new temperate phages.
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Pelyuntha W, Vongkamjan K. Combined effects of Salmonella phage cocktail and organic acid for controlling Salmonella Enteritidis in chicken meat. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108653] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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12
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Sattar S, Ullah I, Khanum S, Bailie M, Shamsi B, Ahmed I, Abbas Shah T, Javed S, Ghafoor A, Pervaiz A, Sohail F, Imdad K, Tariq A, Bostan N, Ali I, Altermann E. Genome Analysis and Therapeutic Evaluation of a Novel Lytic Bacteriophage of Salmonella Typhimurium: Suggestive of a New Genus in the Subfamily Vequintavirinae. Viruses 2022; 14:241. [PMID: 35215834 PMCID: PMC8879037 DOI: 10.3390/v14020241] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 01/09/2022] [Accepted: 01/21/2022] [Indexed: 02/04/2023] Open
Abstract
Salmonella Typhimurium, a foodborne pathogen, is a major concern for food safety. Its MDR serovars of animal origin pose a serious threat to the human population. Phage therapy can be an alternative for the treatment of such MDR Salmonella serovars. In this study, we report on detailed genome analyses of a novel Salmonella phage (Salmonella-Phage-SSBI34) and evaluate its therapeutic potential. The phage was evaluated for latent time, burst size, host range, and bacterial growth reduction in liquid cultures. The phage stability was examined at various pH levels and temperatures. The genome analysis (141.095 Kb) indicated that its nucleotide sequence is novel, as it exhibited only 1-7% DNA coverage. The phage genome features 44% GC content, and 234 putative open reading frames were predicted. The genome was predicted to encode for 28 structural proteins and 40 enzymes related to nucleotide metabolism, DNA modification, and protein synthesis. Further, the genome features 11 tRNA genes for 10 different amino acids, indicating alternate codon usage, and hosts a unique hydrolase for bacterial lysis. This study provides new insights into the subfamily Vequintavirinae, of which SSBI34 may represent a new genus.
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Affiliation(s)
- Sadia Sattar
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (I.U.); (B.S.); (A.P.); (F.S.); (N.B.); (I.A.)
| | - Inam Ullah
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (I.U.); (B.S.); (A.P.); (F.S.); (N.B.); (I.A.)
| | - Sofia Khanum
- AgResearch, Palmerston North 4410, New Zealand; (S.K.); (M.B.); (E.A.)
| | - Marc Bailie
- AgResearch, Palmerston North 4410, New Zealand; (S.K.); (M.B.); (E.A.)
| | - Bushra Shamsi
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (I.U.); (B.S.); (A.P.); (F.S.); (N.B.); (I.A.)
| | - Ibrar Ahmed
- Alpha Genomics Private Limited, Islamabad 45710, Pakistan;
| | - Tahir Abbas Shah
- Functional Genomics Lab, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan;
| | - Sundus Javed
- Microbiology and Immunology Lab, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (S.J.); (K.I.); (A.T.)
| | - Aamir Ghafoor
- University Diagnostic Lab, The University of Veterinary and Animal Sciences (UVAS), Lahore 54000, Pakistan;
| | - Amna Pervaiz
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (I.U.); (B.S.); (A.P.); (F.S.); (N.B.); (I.A.)
| | - Fakiha Sohail
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (I.U.); (B.S.); (A.P.); (F.S.); (N.B.); (I.A.)
| | - Kaleem Imdad
- Microbiology and Immunology Lab, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (S.J.); (K.I.); (A.T.)
| | - Aamira Tariq
- Microbiology and Immunology Lab, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (S.J.); (K.I.); (A.T.)
| | - Nazish Bostan
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (I.U.); (B.S.); (A.P.); (F.S.); (N.B.); (I.A.)
| | - Ijaz Ali
- Molecular Virology Labs, Department of Biosciences, Comsats University Islamabad, Islamabad 45550, Pakistan; (I.U.); (B.S.); (A.P.); (F.S.); (N.B.); (I.A.)
| | - Eric Altermann
- AgResearch, Palmerston North 4410, New Zealand; (S.K.); (M.B.); (E.A.)
- Riddet Institute, Massey University, Palmerston North 4442, New Zealand
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13
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Ilyas SZ, Tariq H, Basit A, Tahir H, Haider Z, Rehman SU. SGP-C: A Broad Host Range Temperate Bacteriophage; Against Salmonella gallinarum. Front Microbiol 2022; 12:768931. [PMID: 35095790 PMCID: PMC8790156 DOI: 10.3389/fmicb.2021.768931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 12/03/2021] [Indexed: 11/13/2022] Open
Abstract
Salmonella gallinarum is a poultry restricted-pathogen causing fowl-typhoid disease in adult birds with mortality rates up-to 80% and exhibit resistance against commonly used antibiotics. In this current study, a temperate broad host range bacteriophage SGP-C was isolated against S. gallinarum from poultry digesta. It showed infection ability in all the 15 tested field strains of S. gallinarum. The SGP-C phage produced circular, turbid plaques with alternate rings. Its optimum activity was observed at pH 7.0 and 37-42°C, with a latent period of 45 min and burst size of 187 virions/bacterial cell. The SGP-C lysogens, SGPC-L5 and SGPC-L6 exhibited super-infection immunity against the same phage, an already reported feature of lysogens. A virulence index of 0.5 and 0.001 as MV50 of SGP-C suggests its moderate virulence. The genome of SGP-C found circular double stranded DNA of 42 Kbp with 50.04% GC content, which encodes 63 ORFs. The presence of repressor gene at ORF49, and absence of tRNA sequence in SGP-C genome indicates its lysogenic nature. Furthermore, from NGS analysis of lysogens we propose that SGP-C genome might exist either as an episome, or both as integrated and temporary episome in the host cell and warrants further studies. Phylogenetic analysis revealed its similarity with Salmonella temperate phages belonging to family Siphoviridae. The encoded proteins by SGP-C genome have not showed homology with any known toxin and virulence factor. Although plenty of lytic bacteriophages against this pathogen are already reported, to our knowledge SGP-C is the first lysogenic phage against S. gallinarum reported so far.
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Affiliation(s)
| | | | | | | | | | - Shafiq ur Rehman
- Institute of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan
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14
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Characterization of N4-like Pseudomonas Phage vB_Pae-PA14 Isolated from Seawater Sampled in Thailand. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2021. [DOI: 10.22207/jpam.15.4.59] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacteriophage, a predator virus of bacteria, is an abundant biological entity in the biosphere. With ultimate applications in medicine and biotechnology, new phages are extensively being isolated and characterized. The objective of the present study was to characterize lytic bacteriophage vB_Pae-PA14 infecting Pseudomonas aeruginosa ATCC 27853 that was isolated from seawater in Thailand. vB_Pae-PA14 was subjected to whole genome phylogenetic analysis, host range test, biofilm test and characterization. Results showed that the phage belonged to a group of N4-like viruses, could infect P. aeruginosa isolates including carbapenem-resistant P. aeruginosa. The burst size of vB_Pae-PA14 was 86 plaque-forming unit/infected cells. Also, the phage showed a greater ability to control planktonic P. aeruginosa cells than the biofilm cells. Phage could withstand physical stresses especially the high salt concentration. In brief, lytic bacteriophage vB_Pae-PA14 infecting P. aeruginosa was isolated and characterized, which might be useful in further bacteriophage lytic applications.
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15
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Isolation and Identification of a Wastewater Siphoviridae Bacteriophage Targeting Multidrug-resistant Klebsiella pneumoniae. Jundishapur J Microbiol 2021. [DOI: 10.5812/jjm.118910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: Based on the WHO, multidrug-resistant Klebsiella pneumoniae is a priority pathogen that causes opportunistic infections and is widely spread in the environment. Phage therapy is considered a natural, safe, and very efficient alternative to treat difficult-to-treat infections. Objectives: This study aimed to isolate highly virulent, lytic bacteriophages and evaluate their efficacy for lysing multidrug-resistant K. pneumoniae. Methods: Municipal wastewater samples were collected and filtered using 0.22 µm syringe filters and cultivated with log-phase cultures of K. pneumoniae using enrichment media. After 48 h of incubation, the cultures were centrifuged, and the resultant supernatant was filtered (0.22 µm). The detection of the phage was done using the spot assay with K. pneumoniae as the host. One-step growth kinetics and bacterial reduction tests were conducted to assess the growth kinetics of the isolated phage. The stability of the isolated phage was characterized by subjecting it to various temperature and pH conditions. The chemical stability of the K. pneumoniae phage was determined by exposing it to various organic compounds. A panel of 20 bacterial strains was tested using the spot assay, as well as double agar overlying assay, to determine the host range of the isolated phage. Results: Out of 40 wastewater samples tested, only one sample was tested positive for the K. pneumoniae phage (2.5%) that was lytic against the host strain. The K. pneumoniae phage had a latent period of 15 min and a burst size of 100 virions per infected cell. It was most stable at 37°C and pH range of 6.0 to 10.0. Chemically, the K. pneumoniae phage was resistant to 10% chloroform treatment. Transmission electron micrograph indicated that the K. pneumoniae phage belonged to the order Caudovirales, family Siphoviridae, morphotype B1. Conclusions: Most of the characteristic features of the K. pneumoniae phage indicated the potential of this phage to be used in phage therapy. Hence, a comprehensive study is highly recommended to characterize the K. pneumoniae phage genome, detect its molecular interactions with the host cell, and determine its lytic activity in combination with other phages, which may lead to the efficient utilization of this phage in phage therapy against K. pneumoniae infections.
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16
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Isolation and Identification of Escherichia coli O157:H7 Lytic Bacteriophage from Environment Sewage. INTERNATIONAL JOURNAL OF FOOD SCIENCE 2021; 2021:7383121. [PMID: 34423027 PMCID: PMC8376447 DOI: 10.1155/2021/7383121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Accepted: 07/24/2021] [Indexed: 11/17/2022]
Abstract
Escherichia coli O157:H7 is one of the pathogenic bacteria causing foodborne disease. The use of lytic bacteriophages can be a good solution to overcome the disease. This study is aimed at isolating lytic bacteriophages from environmental sewage with E. coli O157:H7 bacterial cells. The sample used in this study was eight bacteriophages, and the technique used in identifying E. coli O157:H7 carriers of the stx1 and stx2 genes was PCR. The double layer plaque technique was used to classify bacteriophages. Plaque morphology, host specificity, and electron micrograph were used to identify the bacteriophages. The result obtained plaque morphology as a clear zone with the largest diameter size of 3.5 mm. Lytic bacteriophage could infect E. coli O157:H7 at the highest titer of 10 × 108 PFU/mL. Bacteriophages have been identified as Siphoviridae and Myoviridae. Phage 3, phage 4, and phage 8 could infect Atypical Diarrheagenic E. coli 1 (aDEC1) due to their host specificity. The Friedman statistical tests indicate that lytic bacteriophage can significantly lyse E. coli O157:H7 (p = 0.012). The lysis of E. coli O157:H7 by phage 1, phage 2, phage 3, and phage 5 bacteriophages was statistically significant, according to Conover's posthoc test (p < 0.05). The conclusion obtained from this study is that lytic bacteriophages from environmental sewage could lyse E. coli O157:H7. Therefore, it could be an alternative biocontrol agent against E. coli O157:H7 that contaminates food causing foodborne disease.
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17
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Characterization and Application of a Lytic Phage D10 against Multidrug-Resistant Salmonella. Viruses 2021; 13:v13081626. [PMID: 34452490 PMCID: PMC8402666 DOI: 10.3390/v13081626] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 08/11/2021] [Accepted: 08/12/2021] [Indexed: 01/21/2023] Open
Abstract
Salmonella is a widely distributed foodborne pathogen that is a serious threat to human health. The accelerated development of drug resistance and the increased demand for natural foods invoke new biocontrol agents to limit contamination by multidrug-resistant (MDR) Salmonella strains. In this study, a lytic Salmonella phage named D10 was characterized at the biological and genomic levels. D10 possesses a short latent period (10 min) and a large burst size (163 PFU/cell), as well as adequate stability under a range of pH conditions and moderate thermal tolerance. D10 effectively lysed different MDR Salmonella serovars and repressed their dynamic growth in the medium. Genomic analysis disclosed that D10 is a new member of the Siphoviridae family and lacks the genes implicated in lysogeny, pathogenicity, or antibiotic resistance. A three-ingredient phage cocktail was then developed by mixing D10 with previously identified myovirus D1-2 and podovirus Pu20. The cocktail significantly reduced the count of MDR strains in liquid eggs, regardless of the temperature applied (4 and 25 °C). These results suggest that phage D10 is a promising tool to prevent food contamination by MDR Salmonella.
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18
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Shang Y, Sun Q, Chen H, Wu Q, Chen M, Yang S, Du M, Zha F, Ye Q, Zhang J. Isolation and Characterization of a Novel Salmonella Phage vB_SalP_TR2. Front Microbiol 2021; 12:664810. [PMID: 34234757 PMCID: PMC8256156 DOI: 10.3389/fmicb.2021.664810] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 05/12/2021] [Indexed: 11/22/2022] Open
Abstract
Salmonella is a widely distributed foodborne pathogen. The use of Salmonella phages as biocontrol agents has recently gained significant interest. Because the Salmonella genus has high diversity, efforts are necessary to identify lytic Salmonella phages focusing on different serovars. Here, five Salmonella phages were isolated from soil samples, and vB_SalP_TR2 was selected as a novel phage with high lytic potential against the host Salmonella serovar Albany, as well as other tested serovars, including Corvallis, Newport, Kottbus, and Istanbul. Morphological analyses demonstrated that phage vB_SalP_TR2 belongs to the Podoviridae family, with an icosahedral head (62 ± 0.5 nm in diameter and 60 ± 1 nm in length) and a short tail (35 ± 1 nm in length). The latent period and burst size of phage vB_SalP_TR2 was 15 min and 211 PFU/cell, respectively. It contained a linear dsDNA of 71,453 bp, and G + C content was 40.64%. Among 96 putative open reading frames detected, only 35 gene products were found in database searches, with no virulence or antibiotic resistance genes being identified. As a biological control agent, phage vB_SalP_TR2 exhibited a high temperature and pH tolerance. In vitro, it lysed most S. Albany after 24 h at 37°C with multiplicities of infection of 0.0001, 0.001, 0.01, 0.1, 1, 10, and 100. In food matrices (milk and chicken meat), treatment with phage vB_SalP_TR2 also reduced the number of S. Albany compared with that in controls. These findings highlighted phage vB_SalP_TR2 as a potential antibacterial agent for the control of Salmonella in food samples.
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Affiliation(s)
- Yuting Shang
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
- State Key Laboratory of Food Science and Technology, National Engineering Research Center for Functional Foods, Synergetic Innovation Center of Food Safety, Joint International Research Laboratory on Food Safety, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Qifan Sun
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, China
| | - Hanfang Chen
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Qingping Wu
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Moutong Chen
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Shuanghong Yang
- State Key Laboratory of Food Science and Technology, National Engineering Research Center for Functional Foods, Synergetic Innovation Center of Food Safety, Joint International Research Laboratory on Food Safety, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Mingzhu Du
- State Key Laboratory of Food Science and Technology, National Engineering Research Center for Functional Foods, Synergetic Innovation Center of Food Safety, Joint International Research Laboratory on Food Safety, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Fei Zha
- State Key Laboratory of Food Science and Technology, National Engineering Research Center for Functional Foods, Synergetic Innovation Center of Food Safety, Joint International Research Laboratory on Food Safety, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Qinghua Ye
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Jumei Zhang
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
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19
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Korf IHE, Kittler S, Bierbrodt A, Mengden R, Rohde C, Rohde M, Kroj A, Lehnherr T, Fruth A, Flieger A, Lehnherr H, Wittmann J. In Vitro Evaluation of a Phage Cocktail Controlling Infections with Escherichia coli. Viruses 2020; 12:v12121470. [PMID: 33352791 PMCID: PMC7768485 DOI: 10.3390/v12121470] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 12/11/2020] [Accepted: 12/16/2020] [Indexed: 12/13/2022] Open
Abstract
Worldwide, poultry industry suffers from infections caused by avian pathogenic Escherichia coli. Therapeutic failure due to resistant bacteria is of increasing concern and poses a threat to human and animal health. This causes a high demand to find alternatives to fight bacterial infections in animal farming. Bacteriophages are being especially considered for the control of multi-drug resistant bacteria due to their high specificity and lack of serious side effects. Therefore, the study aimed on characterizing phages and composing a phage cocktail suitable for the prevention of infections with E. coli. Six phages were isolated or selected from our collections and characterized individually and in combination with regard to host range, stability, reproduction, and efficacy in vitro. The cocktail consisting of six phages was able to inhibit formation of biofilms by some E. coli strains but not by all. Phage-resistant variants arose when bacterial cells were challenged with a single phage but not when challenged by a combination of four or six phages. Resistant variants arising showed changes in carbon metabolism and/or motility. Genomic comparison of wild type and phage-resistant mutant E28.G28R3 revealed a deletion of several genes putatively involved in phage adsorption and infection.
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Affiliation(s)
- Imke H. E. Korf
- Leibniz Institute DSMZ—German Collection of Microorganisms and Cell Cultures, Inhoffenstraße 7B, 38124 Braunschweig, Germany; (C.R.); (J.W.)
- Correspondence:
| | - Sophie Kittler
- Institute for Food Quality and Food Safety, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany;
| | | | - Ruth Mengden
- Food Inspection, Animal Welfare and Veterinary Service of the Land of Bremen, Border Control Post Bremerhaven, Senator-Borttscheller-Straße 8, 27568 Bremerhaven, Germany;
| | - Christine Rohde
- Leibniz Institute DSMZ—German Collection of Microorganisms and Cell Cultures, Inhoffenstraße 7B, 38124 Braunschweig, Germany; (C.R.); (J.W.)
| | - Manfred Rohde
- Central Facility for Microscopy, Helmholtz-Centre for Infection Research (HZI), Inhoffenstraße 7, 38124 Braunschweig, Germany;
| | - Andrea Kroj
- PTC Phage Technology Center GmbH, Siemensstraße 42, 59199 Bönen, Germany; (A.K.); (T.L.); (H.L.)
| | - Tatiana Lehnherr
- PTC Phage Technology Center GmbH, Siemensstraße 42, 59199 Bönen, Germany; (A.K.); (T.L.); (H.L.)
| | - Angelika Fruth
- Robert Koch Institute, Burgstraße 37, 38855 Wernigerode, Germany; (A.F.); (A.F.)
| | - Antje Flieger
- Robert Koch Institute, Burgstraße 37, 38855 Wernigerode, Germany; (A.F.); (A.F.)
| | - Hansjörg Lehnherr
- PTC Phage Technology Center GmbH, Siemensstraße 42, 59199 Bönen, Germany; (A.K.); (T.L.); (H.L.)
| | - Johannes Wittmann
- Leibniz Institute DSMZ—German Collection of Microorganisms and Cell Cultures, Inhoffenstraße 7B, 38124 Braunschweig, Germany; (C.R.); (J.W.)
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20
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Sevilla-Navarro S, Catalá-Gregori P, Marin C. Salmonella Bacteriophage Diversity According to Most Prevalent Salmonella Serovars in Layer and Broiler Poultry Farms from Eastern Spain. Animals (Basel) 2020; 10:E1456. [PMID: 32825110 PMCID: PMC7552790 DOI: 10.3390/ani10091456] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 08/17/2020] [Accepted: 08/18/2020] [Indexed: 11/27/2022] Open
Abstract
The exploration of novel nonantibiotic interventions in the field, such as the use of bacteriophages, is necessary to avoid the presence of Salmonella. Bacteriophages are a group of viruses widely distributed in nature, strictly associated with the prokaryotic cell. Researchers have demonstrated the success of phage therapy in reducing Salmonella counts in poultry products. However, the impact that phage concentration in the environment may have against certain Salmonella serovars is not well understood. Therefore, the aim of this study was to assess Salmonella phage prevalence in commercial poultry farms in terms of the production type: layers or broilers. The most prevalent Salmonella serovars isolated in poultry production were used for phage isolation. Salmonella specific phages were isolated from 141 layer and broiler farms located in the Valencia region during 2019. Analysis of the samples revealed that 100% presented Salmonella phages, the most prevalent being against serovar S. Enteritidis (93%), followed by S. Virchow (59%), S. Typhimurium (55%), S. Infantis (52%) and S. Ohio (51%). These results indicate that poultry farms could represent an important source of Salmonella phages. Nevertheless, further studies are needed to assess the epidemiology of phages against other serovars present in other countries and their diversity from the point of view of molecular studies.
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Affiliation(s)
- Sandra Sevilla-Navarro
- Centro de Calidad Avícola y Alimentación Animal de la Comunidad Valenciana (CECAV), Calle Nules 16, 12539 Castellón, Spain;
- Departamento de Producción y Sanidad Animal, Salud Pública Veterinaria y Ciencia y Tecnología de los Alimentos, Instituto de Ciencias Biomédicas, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, Avenida Seminario s/n, 46113 Moncada, Spain;
| | - Pablo Catalá-Gregori
- Centro de Calidad Avícola y Alimentación Animal de la Comunidad Valenciana (CECAV), Calle Nules 16, 12539 Castellón, Spain;
- Departamento de Producción y Sanidad Animal, Salud Pública Veterinaria y Ciencia y Tecnología de los Alimentos, Instituto de Ciencias Biomédicas, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, Avenida Seminario s/n, 46113 Moncada, Spain;
| | - Clara Marin
- Departamento de Producción y Sanidad Animal, Salud Pública Veterinaria y Ciencia y Tecnología de los Alimentos, Instituto de Ciencias Biomédicas, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, Avenida Seminario s/n, 46113 Moncada, Spain;
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21
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Sorour HK, Gaber AF, Hosny RA. Evaluation of the efficiency of using Salmonella Kentucky and Escherichia coli O119 bacteriophages in the treatment and prevention of salmonellosis and colibacillosis in broiler chickens. Lett Appl Microbiol 2020; 71:345-350. [PMID: 32628287 DOI: 10.1111/lam.13347] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 06/03/2020] [Accepted: 06/28/2020] [Indexed: 11/28/2022]
Abstract
Phage therapy is considered an alternative modality in the treatment of different bacterial diseases. However, their therapeutic and preventive roles against infections caused by Salmonella Kentucky and Escherichia coli O119 were of little attention. In this study, two phages were isolated, characterized and assessed for their potential therapeutic and preventive roles against S. Kentucky and E. coli O119 infections in broilers. Commercial 1-day-old arboacres broiler chicks were assigned to seven groups: Group Ӏ was as a negative control, groups (П and Ш) were assigned as positive controls by the challenge of S. Kentucky and E. coli O119, respectively. The remaining four groups (IV, V, VI and VII) were administrated with five repeated phage doses to determine the effect of multiple doses. Phages were administrated in groups (IV and VI) after challenging with S. Kentucky and E. coli O119, respectively to assess their therapeutic role; moreover, their preventive role was evaluated through administration in groups (V and VII) before challenging with S. Kentucky and E. coli O119, respectively. Sampling was done from different organs at three time points and revealed that phage-treated groups had lower colony forming units of S. Kentucky and E. coli. Our results suggest that bacteriophages are efficient in the treatment and prevention of salmonellosis and colibacillosis in broiler farms.
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Affiliation(s)
- H K Sorour
- Reference Laboratory for Veterinary Quality Control on Poultry Production, Animal Health Research Institute, Agriculture Research Center, Giza, Egypt
| | - A F Gaber
- Reference Laboratory for Veterinary Quality Control on Poultry Production, Animal Health Research Institute, Agriculture Research Center, Giza, Egypt
| | - R A Hosny
- Reference Laboratory for Veterinary Quality Control on Poultry Production, Animal Health Research Institute, Agriculture Research Center, Giza, Egypt
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22
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Yıldirim Z, Sakin T, Akçelik M, Akçelik N. Identification and characterization of lytic bacteriophages specific to foodborne pathogenic Escherichia coli O157:H7. FOOD SCI TECHNOL INT 2020; 27:56-72. [PMID: 32536218 DOI: 10.1177/1082013220929836] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The objective of this study was to identify and characterize five different lytic bacteriophages specific to Escherichia coli O157:H7. vB_EcoM-P12, vB_EcoM-P13, vB_EcoM-P23, and vB_EcoM-P34 phages belonged to the Myoviridae family and vB_EcoS-P24 phage was in the Siphoviridae family. Their plaque sizes changed between 0.48 ± 0.03 and 0.90 ± 0.03 mm in diameter. stx1 and stx2 virulent gene regions were absent in the genome of five Eco-phages and their genome size was 33 kbp. The protein band profiles of the five phages were found to be different from each other. Their latent period, burst size, and burst time changed between 10-15 min, 72-144 PFU/cell and 20-35 min, respectively. Multiplicity of infection values and mutant frequency of the phages were among 0.1-0.001 and 1.14 × 10-7-3.69 × 10-8, respectively. The phages had strong lytic activity against their host bacteria (E. coli NCTC 12900, ATCC 43888, and ATCC 35150) at 5-37 ℃ and adsorbed to their host cells by 92.7-97.5% in the first five minutes of incubation. These phages are thought to be good candidates as therapeutic and biocontrol agents against E. coli O157:H7 in the veterinary science and food industry due to short latent period, high burst size, rapid development in host cells, high lytic activity, high adsorption rate, stability over a wide pH range and high temperature, and absence of stx1 and stx2 genes.
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Affiliation(s)
- Zeliha Yıldirim
- Department of Food Engineering, Niğde Ömer Halisdemir University, Niğde, Turkey
| | - Tuba Sakin
- Department of Food Engineering, Niğde Ömer Halisdemir University, Niğde, Turkey
| | | | - Nefise Akçelik
- Institute of Biotechnology, Ankara University, Ankara, Turkey
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23
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Kim JH, Kim HJ, Jung SJ, Mizan MFR, Park SH, Ha SD. Characterization of Salmonella spp.-specific bacteriophages and their biocontrol application in chicken breast meat. J Food Sci 2020; 85:526-534. [PMID: 32043599 DOI: 10.1111/1750-3841.15042] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 12/11/2019] [Accepted: 12/18/2019] [Indexed: 02/06/2023]
Abstract
Chicken breast meat is considered as the main source of Salmonella infection in humans. The aim of this study was to isolate lytic bacteriophages specific for Salmonella enterica serovars Enteritidis and examine their efficacy in a cocktail for the biocontrol of Salmonella spp. in raw chicken breast meat. Four lytic phages belonging to the Myoviridae and Siphoviridae families were isolated from a river proximate to a duck farm. They exhibited broad lytic activities against 11 strains of S. Enteritidis, 11 strains of S. Typhimurium, and one each of S. Paratyphi A, S. San Diego, and S. Typhi. The phages were determined to be stable, exhibited similar degrees of resistance to heat and pH, and had latent periods ranging from 5 to 30 min. In addition, the phage particles were 100% adsorbed within 18 to 40 min. Viable cell counts of bacteria were significantly reduced in raw chicken breast samples (P < 0.05) when treated with a cocktail of all four bacteriophages at 4 °C for 7 days (multiplicities of infection were from 104 to 106 ). These results indicate the potential efficacy of the bacteriophage cocktail as a biological agent against S. Enteritidis in raw chicken breast meat. PRACTICAL APPLICATION: Our findings demonstrate that the phages could be effective in reducing the viability of Salmonella spp. bacteria in chicken breast meat. Therefore, the phage cocktail is a potential bactericidal agent for the biocontrol of Salmonella spp. in raw chicken breast meat and could be used use in various poultry industries in the future.
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Affiliation(s)
- Jin Hee Kim
- School of Food Science and Technology, Chung-Ang Univ., 72-1 Nae-Ri, Daeduck-Myun, Anseong, Gyunggido, 456-756, Republic of Korea
| | - Hee Jeong Kim
- School of Food Science and Technology, Chung-Ang Univ., 72-1 Nae-Ri, Daeduck-Myun, Anseong, Gyunggido, 456-756, Republic of Korea
| | - Soo Jin Jung
- School of Food Science and Technology, Chung-Ang Univ., 72-1 Nae-Ri, Daeduck-Myun, Anseong, Gyunggido, 456-756, Republic of Korea
| | - Md Furkanur Rahaman Mizan
- School of Food Science and Technology, Chung-Ang Univ., 72-1 Nae-Ri, Daeduck-Myun, Anseong, Gyunggido, 456-756, Republic of Korea
| | - Si Hong Park
- Dept. of Food Science and Technology, Oregon State Univ., Corvallis, USA
| | - Sang-Do Ha
- School of Food Science and Technology, Chung-Ang Univ., 72-1 Nae-Ri, Daeduck-Myun, Anseong, Gyunggido, 456-756, Republic of Korea
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Liu A, Liu Y, Peng L, Cai X, Shen L, Duan M, Ning Y, Liu S, Li C, Liu Y, Chen H, Wu W, Wang X, Hu B, Li C. Characterization of the narrow-spectrum bacteriophage LSE7621 towards Salmonella Enteritidis and its biocontrol potential on lettuce and tofu. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2019.108791] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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25
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Bao H, Shahin K, Zhang Q, Zhang H, Wang Z, Zhou Y, Zhang X, Zhu S, Stefan S, Wang R. Morphologic and genomic characterization of a broad host range Salmonella enterica serovar Pullorum lytic phage vB_SPuM_SP116. Microb Pathog 2019; 136:103659. [DOI: 10.1016/j.micpath.2019.103659] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Revised: 08/06/2019] [Accepted: 08/06/2019] [Indexed: 11/24/2022]
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26
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Yildirim Z, Sakin T, Akçelik M, Akçelik N. Characterization of SE-P3, P16, P37, and P47 bacteriophages infectingSalmonellaEnteritidis. J Basic Microbiol 2019; 59:1049-1062. [DOI: 10.1002/jobm.201900102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 05/30/2019] [Accepted: 06/22/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Zeliha Yildirim
- Department of Food Engineering, Faculty of Engineering; Niğde Ömer Halisdemir University; Niğde Turkey
| | - Tuba Sakin
- Department of Food Engineering, Faculty of Engineering; Niğde Ömer Halisdemir University; Niğde Turkey
| | - Mustafa Akçelik
- Department of Biology, Faculty of Science; Ankara University; Ankara Turkey
| | - Nesife Akçelik
- Department of Biotecnology, Institute of Biotechnology; Ankara University; Ankara Turkey
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27
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Rivera D, Hudson LK, Denes TG, Hamilton-West C, Pezoa D, Moreno-Switt AI. Two Phages of the Genera Felixounavirus Subjected to 12 Hour Challenge on Salmonella Infantis Showed Distinct Genotypic and Phenotypic Changes. Viruses 2019; 11:E586. [PMID: 31252667 PMCID: PMC6669636 DOI: 10.3390/v11070586] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 06/23/2019] [Accepted: 06/25/2019] [Indexed: 12/15/2022] Open
Abstract
Salmonella Infantis is considered in recent years an emerging Salmonella serovar, as it has been associated with several outbreaks and multidrug resistance phenotypes. Phages appear as a possible alternative strategy to control Salmonella Infantis (SI). The aims of this work were to characterize two phages of the Felixounavirus genus, isolated using the same strain of SI, and to expose them to interact in challenge assays to identify genetic and phenotypic changes generated from these interactions. These two phages have a shared nucleotide identity of 97% and are differentiated by their host range: one phage has a wide host range (lysing 14 serovars), and the other has a narrow host range (lysing 6 serovars). During the 12 h challenge we compared: (1) optical density of SI, (2) proportion of SI survivors from phage-infected cultures, and (3) phage titer. Isolates obtained through the assays were evaluated by efficiency of plating (EOP) and by host-range characterization. Genomic modifications were characterized by evaluation of single nucleotide polymorphisms (SNPs). The optical density (600 nm) of phage-infected SI decreased, as compared to the uninfected control, by an average of 0.7 for SI infected with the wide-host-range (WHR) phage and by 0.3 for SI infected with the narrow-host-range (NHR) phage. WHR phage reached higher phage titer (7 × 1011 PFU/mL), and a lower proportion of SI survivor was obtained from the challenge assay. In SI that interacted with phages, we identified SNPs in two genes (rfaK and rfaB), which are both involved in lipopolysaccharide (LPS) polymerization. Therefore, mutations that could impact potential phage receptors on the host surface were selected by lytic phage exposure. This work demonstrates that the interaction of Salmonella phages (WHR and NHR) with SI for 12 h in vitro leads to emergence of new phenotypic and genotypic traits in both phage and host. This information is crucial for the rational design of phage-based control strategies.
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Affiliation(s)
- Dácil Rivera
- Escuela de Medicina Veterinaria, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago 8320000, Chile.
- Departamento de Ciencia de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago 8380492, Chile.
| | - Lauren K Hudson
- Department of Food Science, University of Tennessee, Knoxville, TN 37996, USA.
| | - Thomas G Denes
- Department of Food Science, University of Tennessee, Knoxville, TN 37996, USA.
| | - Christopher Hamilton-West
- Departamento de Medicina Preventiva Animal, Facultad de Ciencias Veterinarias, Universidad de Chile, Santiago 8330015, Chile.
| | - David Pezoa
- Escuela de Medicina Veterinaria, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile.
| | - Andrea I Moreno-Switt
- Escuela de Medicina Veterinaria, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago 8320000, Chile.
- Millennium Nucleus for Collaborative Research on Bacterial Resistance (MICROB-R), Santiago 7550000, Chile.
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Petsong K, Benjakul S, Vongkamjan K. Evaluation of storage conditions and efficiency of a novel microencapsulated Salmonella phage cocktail for controlling S. enteritidis and S. typhimurium in-vitro and in fresh foods. Food Microbiol 2019; 83:167-174. [PMID: 31202408 DOI: 10.1016/j.fm.2019.05.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 05/15/2019] [Accepted: 05/17/2019] [Indexed: 12/17/2022]
Abstract
S. Enteritidis and S. Typhimurium are typically linked to foodborne outbreaks. Phages have continued to expand in various food applications. In this study, microencapsulation is applied for enhancing the stability and efficacy of phages as bio-control agent. Microencapsulated phage cocktail kept in aluminium laminated foil bag (LF) at 4 °C showed the highest survivability with a titer loss of 0.5 log PFU/g after 12 weeks of storage. Titer loss of phage cocktail lysate >4 log PFU/mL was observed after 12 weeks, at 4 °C. Color change of microencapsulated phage cocktail kept in LF at 4 °C did not show any significant difference during storage, and water activity (free water content) at 0.13 was found in these conditions. In-vitro study, S. Enteritidis and S. Typhimurium were decreased 1.79 and 3.63 log CFU/mL, respectively at 37 °C. Whereas, 0.43 and 0.76 log CFU/mL, respectively were observed at 10 °C. In foods, S. Enteritidis and S. Typhimurium were decreased 0.57 and 1.78 log CFU/cm2, respectively in meat. Whereas, 0.86 and 1.2 log CFU/g, respectively were observed in sprout. Foods with/without microencapsulated phage cocktail showed non-significant differences in liking scores after 2 days of storage. Overall, microencapsulated phage cocktail suggests another alternative for phage-based biocontrol with improved stability and efficacy for food application.
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Affiliation(s)
- Kantiya Petsong
- Department of Food Technology, Prince of Songkla University, Hat Yai, 90112, Thailand
| | - Soottawat Benjakul
- Department of Food Technology, Prince of Songkla University, Hat Yai, 90112, Thailand
| | - Kitiya Vongkamjan
- Department of Food Technology, Prince of Songkla University, Hat Yai, 90112, Thailand.
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Lysis Profiles of Salmonella Phages on Salmonella Isolates from Various Sources and Efficiency of a Phage Cocktail against S. Enteritidis and S. Typhimurium. Microorganisms 2019; 7:microorganisms7040100. [PMID: 30959743 PMCID: PMC6518243 DOI: 10.3390/microorganisms7040100] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/01/2019] [Accepted: 04/01/2019] [Indexed: 01/01/2023] Open
Abstract
Salmonella enterica serovar Enteritidis and Salmonella enterica serovar Typhimurium are major foodborne pathogens of concern worldwide. Bacteriophage applications have gained more interest for biocontrol in foods. This study isolated 36 Salmonella phages from several animal farms in Thailand and tested them on 47 Salmonella strains from several sources, including farms, seafood processing plant and humans in Thailand and USA. Phages were classified into three major groups. The estimated phage genome size showed the range from 50 ± 2 to 200 ± 2 kb. An effective phage cocktail consisting of three phages was developed. Approximately 4 log CFU/mL of S. Enteritidis and S. Typhimurium could be reduced. These phages revealed a burst size of up to 97.7 on S. Enteritidis and 173.7 PFU/cell on S. Typhimurium. Our phage cocktail could decrease S. Enteritidis on chicken meat and sunflower sprouts by 0.66 log CFU/cm2 and 1.27 log CFU/g, respectively. S. Typhimurium on chicken meat and sunflower sprouts were decreased by 1.73 log CFU/cm2 and 1.17 log CFU/g, respectively. Overall, animal farms in Thailand provided high abundance and diversity of Salmonella phages with the lysis ability on Salmonella hosts from various environments and continents. A developed phage cocktail suggests a potential biocontrol against Salmonella in fresh foods.
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30
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Newase SK, Gupta A, Dastager SG, Kapadnis BP, Shashidhar R. Development and evaluation of taxon-specific primers for the selected Caudovirales taxa. Virus Res 2019; 263:184-188. [PMID: 30769122 DOI: 10.1016/j.virusres.2019.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 01/16/2019] [Accepted: 02/11/2019] [Indexed: 11/30/2022]
Abstract
The phage taxonomy is primarily based on the morphology derived from Transmission Electron Microscopic (TEM) studies. TEM based characterization is authentic and accepted by scientific community. However, TEM based identification is expensive and time consuming. After the phage isolation, before analysis TEM, a DNA based rapid method could be introduced. The DNA based method could dramatically reduce the number of samples analyzed by TEM and thereby increase the speed and reduce the cost of identification. In the present work, four environmental phage isolates were identified based on TEM studies and genome size. The identification of these four phages was validated using DNA based method. The taxon-specific DNA markers were identified through multiple sequence alignments. The primers were designed at conserved genes (DNA polymerase or integrase) of 4 different phage taxa viz. family Ackermannviridae, genus Jerseyvirus, genus T4virus, and genus P22virus. These primers were evaluated using both in vitro and in silico approach for the amplification of the target taxons. Majority of the primer sets were found to amplify member species of the targeted taxa in vitro. In In silico analysis, six primer sets intended for identification of family Ackermannviridae showed positive amplification of ≥86.7% classified species. Further, the primers targeting the genus Jerseyvirus and T4virus showed the amplification of 53.8% and ≥84.6% species, respectively. The present work is a case study performed to explore the possibility of use of taxon-specific primers for identification and taxonomic studies of newly isolated phages to supplement the TEM.
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Affiliation(s)
- Sandeep K Newase
- Department of Microbiology, Savitribai Phule Pune University, Ganeshkhind, Pune, 411007, India; Food Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Alka Gupta
- Molecular Biology Division, Bhabha Atomic Research Center, Mumbai, 400085, India
| | - Syed G Dastager
- National Collection of Industrial Micro-organisms (NCIM) Resource Center, Biochemical Sciences Division, CSIR-NCL, Pune, 411008, India
| | - Balu P Kapadnis
- Department of Microbiology, Savitribai Phule Pune University, Ganeshkhind, Pune, 411007, India.
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31
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Lytic KFS-SE2 phage as a novel bio-receptor for Salmonella Enteritidis detection. J Microbiol 2019; 57:170-179. [PMID: 30706346 DOI: 10.1007/s12275-019-8610-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 11/26/2018] [Accepted: 12/03/2018] [Indexed: 10/27/2022]
Abstract
Since Salmonella Enteritidis is one of the major foodborne pathogens, on-site applicable rapid detection methods have been required for its control. The purpose of this study was to isolate and purify S. Enteritidis-specific phage (KFS-SE2 phage) from an eel farm and to investigate its feasibility as a novel, efficient, and reliable bio-receptor for its employment. KFS-SE2 phage was successfully isolated at a high concentration of (2.31 ± 0.43) × 1011 PFU/ml, and consisted of an icosahedral head of 65.44 ± 10.08 nm with a non-contractile tail of 135.21 ± 12.41 nm. The morphological and phylogenetic analysis confirmed that it belongs to the Pis4avirus genus in the family of Siphoviridae. KFS-SE2 genome consisted of 48,608 bp with 45.7% of GC content. Genome analysis represented KFS-SE2 to have distinctive characteristics as a novel phage. Comparative analysis of KFS-SE2 phage with closely related strains confirmed its novelty by the presence of unique proteins. KFS-SE2 phage exhibited excellent specificity to S. Enteritidis and was stable under the temperature range of 4 to 50°C and pH of 3 to 11 (P < 0.05). The latent time was determined to be 20 min. Overall, a new lytic KFS-SE2 phage was successfully isolated from the environment at a high concentration and the excellent feasibility of KFS-SE2 phage was demonstrated as a new bio-receptor for S. Enteritidis detection.
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32
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Nabil NM, Tawakol MM, Hassan HM. Assessing the impact of bacteriophages in the treatment of Salmonella in broiler chickens. Infect Ecol Epidemiol 2018; 8:1539056. [PMID: 30397428 PMCID: PMC6211228 DOI: 10.1080/20008686.2018.1539056] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 10/18/2018] [Indexed: 01/30/2023] Open
Abstract
Salmonellosis is one of the main bacterial infections affecting commercial poultry, causing losses to poultry production, and posing a public health concern. Samples from internal organs (liver, cecum and spleen) of one hundred diseased broiler chickens were collected and subjected to Salmonella isolation, identification and serotyping. S. typhimurium and S. enteritidis were selected from the isolated Salmonella to prepare bacteriophages from sewage water taken at broiler farms. An experimental infection of one day old specific pathogen free (SPF) chicks followed by treatment with the prepared bacteriophages isolated from both Salmonella was performed. Caecal samples from infected chicks were subjected at intervals to bacteriophage isolation and Salmonella quantitation. The effectiveness of bacteriophage treatments on Salmonella colonization in cecum of infected chicks increased after five successive doses. At 3 day post infection (dpi), cecal contents showed a marginal decrease in Salmonella loads with more reduction at 5 dpi. From 7 dpi to the end of the experiment at 15 dpi, all the chicks were cleared for both Salmonella. The findings of this study demonstrate that bacteriophage treatment is efficacious in reducing S. typhimurium and S. enteritidis colonization in broiler chickens within a short period and could be used as an alternative to antibiotics.
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Affiliation(s)
- Nehal M Nabil
- Reference Laboratory for Veterinary Quality control on Poultry production, Animal health research institute, Giza, Egypt
| | - Maram M Tawakol
- Reference Laboratory for Veterinary Quality control on Poultry production, Animal health research institute, Giza, Egypt
| | - Heba M Hassan
- Reference Laboratory for Veterinary Quality control on Poultry production, Animal health research institute, Giza, Egypt
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33
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Yildirim Z, Sakіn T, Çoban F. Isolation of lytic bacteriophages infecting Salmonella Typhimurium and Salmonella Enteritidis. ACTA BIOLOGICA HUNGARICA 2018; 69:350-369. [PMID: 30257585 DOI: 10.1556/018.68.2018.3.10] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The objectives of this study were to isolate, purify and determine host range of lytic bacteriophages infecting foodborne the pathogen Salmonella Typhimurium and S. Enteritidis. River/stream water, sewage, raw foods, wastewater from food processing plants, slaughterhouse and fish farms and water from troughs were used for the screening of bacteriophages. The richest sources in terms of phages infecting S. Typhimurium and Enteritidis were found to be sewage, wastewaters of slaughterhouse, food processing and fisheries and streams. A total of 33 S. Typhimurium and 56 S. Enteritidis phages were isolated and purified from the samples. It was demostrated that host ranges of the isolated phages were quite wide. The numbers of bacteria types inhibited by S. Typhimurium or Enteritidis phages were changed among 1-15 and 1-19, respectively. It was found that 75.8% (25 out of 33) and 83.93% (47 out of 56) of isolated S. Typhimurium or Enteritidis phages formed clear plaques and were capable of lysing at least six or two Salmonella serovars. Beside Salmonella serovars, some S. Typhimurium (15 out of 33, 45.5%) and S. Enteritidis phages (5 out of 56, 8.93%) were also infective against E. coli strains. The host ranges of S. Typhimurium phages were wider than those of S. Enteritidis.
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Affiliation(s)
- Zeliha Yildirim
- Niğde Ömer Halisdemir University, Faculty of Engineering, Department of Food Engineering, Niğde, Turkey
| | - Tuba Sakіn
- Niğde Ömer Halisdemir University, Faculty of Engineering, Department of Food Engineering, Niğde, Turkey
| | - Fatma Çoban
- Niğde Ömer Halisdemir University, Faculty of Engineering, Department of Food Engineering, Niğde, Turkey
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34
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Huang C, Virk SM, Shi J, Zhou Y, Willias SP, Morsy MK, Abdelnabby HE, Liu J, Wang X, Li J. Isolation, Characterization, and Application of Bacteriophage LPSE1 Against Salmonella enterica in Ready to Eat (RTE) Foods. Front Microbiol 2018; 9:1046. [PMID: 29887839 PMCID: PMC5982681 DOI: 10.3389/fmicb.2018.01046] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 05/02/2018] [Indexed: 01/21/2023] Open
Abstract
Salmonella infection is an important foodborne consumer health concern that can be mitigated during food processing. Bacteriophage therapy imparts many advantages over conventional chemical preservatives including pathogen specificity, natural derivation, potency, and providing a high degree of safety. The objective of this study aimed to isolate and characterize a phage that effectively control Salmonella food contamination. Out of 35 isolated phages, LPSE1 demonstrated a broad Salmonella host range, robust lytic ability, extensive pH tolerance, and prolonged thermal stability. The capacity for phage LPSE1 to control Salmonella Enteritidis-ATCC13076 in milk, sausage, and lettuce was established. Incubation of LPSE1 at 28°C in milk reduced recoverable Salmonella by approximately 1.44 log10 CFU/mL and 2.37 log10 CFU/mL at MOI of 1 and 100, respectively, as relative to the phage-excluded control. Upon administration of LPSE1 at an MOI of 1 in sausage, Salmonella count decreased 0.52 log10 at 28°C. At MOI of 100, the count decreased 0.49 log10 at 4°C. Incubation of LPSE1 on lettuce reduced recoverable Salmonella by 2.02 log10, 1.71 log10, and 1.45 log10 CFU/mL at an MOI of 1, 10, and 100, respectively, as relative to the negative control. Taken together, these findings establish LPSE1 as an effective weapon against human pathogenic Salmonella in various ready to eat foods.
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Affiliation(s)
- Chenxi Huang
- Bio-Medical Center, Key Laboratory of Environment Correlative Dietology, State Key Laboratory of Agricultural Microbiology, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Safiullah M Virk
- Bio-Medical Center, Key Laboratory of Environment Correlative Dietology, State Key Laboratory of Agricultural Microbiology, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Jianchun Shi
- Bio-Medical Center, Key Laboratory of Environment Correlative Dietology, State Key Laboratory of Agricultural Microbiology, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Yang Zhou
- College of Fisheries, Huazhong Agricultural University, Wuhan, China.,Department of Infectious Diseases and Pathology, University of Florida, Gainesville, FL, United States
| | - Stephan P Willias
- Department of Infectious Diseases and Pathology, University of Florida, Gainesville, FL, United States
| | - Mohamed K Morsy
- Department of Food Technology, Faculty of Agriculture, Benha University, Benha, Egypt
| | - Hazem E Abdelnabby
- Department of Food Technology, Faculty of Agriculture, Benha University, Benha, Egypt
| | - Jie Liu
- College of Medicine, Hebei University of Engineering, Handan, China
| | - Xiaohong Wang
- Bio-Medical Center, Key Laboratory of Environment Correlative Dietology, State Key Laboratory of Agricultural Microbiology, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Jinquan Li
- Bio-Medical Center, Key Laboratory of Environment Correlative Dietology, State Key Laboratory of Agricultural Microbiology, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, China
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35
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Litt PK, Saha J, Jaroni D. Characterization of Bacteriophages Targeting Non-O157 Shiga Toxigenic Escherichia coli. J Food Prot 2018; 81:785-794. [PMID: 29624104 DOI: 10.4315/0362-028x.jfp-17-460] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Non-O157 Shiga toxigenic Escherichia coli (STEC) are an important group of foodborne pathogens, implicated in several outbreaks and recalls in the past 2 decades. It is therefore crucial to devise effective control strategies against these pathogens. Bacteriophages present an attractive alternative to conventional pathogen control methods in the food industry. Bacteriophages, targeting non-O157 STEC (O26, O45, O103, O111, O121, O145), were isolated from beef cattle operations in Oklahoma. Their host range and lytic ability were determined against several ( n = 21) non-O157 STEC isolates, by using the spot-on-lawn assay. Isolated phages were purified, and their morphology was determined under a transmission electron microscope. Infection kinetics of selected phages ( n = 19), particularly adsorption rate, rise period, latent period, and burst size, were determined. Phages were also evaluated for stability at a wide pH range (1 to 11) and temperature range (-80 to 90°C). In total, 45 phages were isolated and classified into Myoviridae, Siphoviridae, or Tectiviridae. The phages had a latent period between 8 and 37 min, a rise period between 19 and 40 min, and a large burst size (12 to 794 virions per infected cell), indicating high lytic activity. Tested phages were stable at pH 5 to 9 for 24 h, whereas a decrease in phage titer was observed at pHs 1, 2, and 11. Phages were stable at 40 and 60°C, except for O103-specific phages. At 70°C, all the phages lost viability after 20 min, except three phages targeting O26 and O121 and one phage targeting O45 and O111 STEC, which remained viable for 60 min. All the phages lost activity after 10 min at 90°C, except one each of O26 and O121 STEC-infecting phages that remained viable for 60 min. Phages remained stable for 90 days under refrigerated (4°C) and frozen (-20 and -80°C) storage. Characterization of phages, targeting diverse non-O157 STEC serotypes, could help in the development of effective biocontrol strategies for this group of pathogens in the food industry.
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Affiliation(s)
- Pushpinder Kaur Litt
- Food and Agricultural Products Center and Department of Animal Science, Oklahoma State University, Stillwater, Oklahoma 74075, USA (ORCID: http://orcid.org/0000-0002-2673-0728 [P.K.L.]; http://orcid.org/0000-0002-7994-0550 [D.J.])
| | - Joyjit Saha
- Food and Agricultural Products Center and Department of Animal Science, Oklahoma State University, Stillwater, Oklahoma 74075, USA (ORCID: http://orcid.org/0000-0002-2673-0728 [P.K.L.]; http://orcid.org/0000-0002-7994-0550 [D.J.])
| | - Divya Jaroni
- Food and Agricultural Products Center and Department of Animal Science, Oklahoma State University, Stillwater, Oklahoma 74075, USA (ORCID: http://orcid.org/0000-0002-2673-0728 [P.K.L.]; http://orcid.org/0000-0002-7994-0550 [D.J.])
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Litt PK, Jaroni D. Isolation and Physiomorphological Characterization of Escherichia coli O157:H7-Infecting Bacteriophages Recovered from Beef Cattle Operations. Int J Microbiol 2017; 2017:7013236. [PMID: 29123549 PMCID: PMC5662819 DOI: 10.1155/2017/7013236] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 08/30/2017] [Indexed: 11/18/2022] Open
Abstract
Bacteriophages, recovered from beef cattle environment and specifically targeting Escherichia coli O157:H7, were examined for their physiological and morphological characteristics. Degree of bacterial lysis and host range of isolated bacteriophages was determined against 55 isolates of E. coli O157:H7. Morphology of phages was examined under transmission electron microscope. Phage growth parameters, particularly rate of adsorption, rise period, latent period, and burst size were also determined. The stability of isolated phages was tested at acidic and alkaline pH, at high temperatures, and in cold storage. A total of 7 phages were isolated which showed lytic activity against 50 out of 55 isolates of E. coli O157:H7. Based on the morphology, phages were classified into Myoviridae or Siphoviridae family. Phages had a rise period between 19 and 40 min, a short latent period between 12 and 30 min, and a large burst size (89-631 virions per infected cell), indicating high lytic activity. Phages remained stable for 24 h at a wide pH (1-11) and temperature range (40-60°C) and for 90 d in cold storage. Characterization of bacteriophages, with a diverse host range of E. coli O157:H7, could aid in the development of effective biocontrol strategies for this pathogen in the food industry.
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Affiliation(s)
- Pushpinder Kaur Litt
- Department of Animal Science and Food and Agricultural Products Center, Oklahoma State University, 148 FAPC, Monroe St., Stillwater, OK 74078, USA
| | - Divya Jaroni
- Department of Animal Science and Food and Agricultural Products Center, Oklahoma State University, 148 FAPC, Monroe St., Stillwater, OK 74078, USA
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Ahmadi M, Karimi Torshizi MA, Rahimi S, Dennehy JJ. Prophylactic Bacteriophage Administration More Effective than Post-infection Administration in Reducing Salmonella enterica serovar Enteritidis Shedding in Quail. Front Microbiol 2016; 7:1253. [PMID: 27555842 PMCID: PMC4977285 DOI: 10.3389/fmicb.2016.01253] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Accepted: 07/28/2016] [Indexed: 11/22/2022] Open
Abstract
Infections caused by Salmonella bacteria, often through poultry products, are a serious public health issue. Because of drawbacks associated with antibiotic prophylaxis, alternative treatments are sought. Bacterial viruses (bacteriophages) may provide an effective alternative, but concerns remain with respect to bacteriophage stability and effectiveness. To this end, we assessed the stability of a novel bacteriophage isolated from poultry excreta, siphovirus PSE, and its effectiveness in reducing Salmonella enterica serovar Enteritidis colonization in vitro and in vivo. Moreover, we sought to determine how the timing (prophylactic or therapeutic) and route (oral gavage or vent lip) of PSE administration impacted its effectiveness. Here we report that significant quantities of viable PSE bacteriophages were recovered following exposure to high and low pH, high temperatures, and bile salts, testifying to its ability to survive extreme conditions. In addition, we found that ileal lactic acid bacteria and Streptococcus spp. counts increased, but colibacilli and total aerobe counts decreased, in quail receiving phage PSE through both oral gavage and vent lip routes. In other experiments, we assessed the efficiency of PSE administration, in both prophylactic and therapeutic contexts, via either oral gavage or vent lip administration, on S. Enteritidis colonization of quail cecal tonsils. Our results demonstrate that administration of PSE as a preventive agent could reduce the S. Enteritidis colonization more effectively than post-challenge administration. Furthermore, oral administration of PSE phage is a more effective prophylactic tool for reduction of S. Enteritidis shedding in poultry than is vent lip administration.
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Affiliation(s)
- Mosab Ahmadi
- Department of Poultry Science, Faculty of Agriculture, Tarbiat Modares University Tehran, Iran
| | - M Amir Karimi Torshizi
- Department of Poultry Science, Faculty of Agriculture, Tarbiat Modares University Tehran, Iran
| | - Shaban Rahimi
- Department of Poultry Science, Faculty of Agriculture, Tarbiat Modares University Tehran, Iran
| | - John J Dennehy
- Biology Department, Queens College and The Graduate Center of the City University of New York, New York NY, USA
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Zhou Y, Bao H, Zhang H, Wang R. Isolation and Characterization of Lytic Phage vB_EcoM_JS09 against Clinically Isolated Antibiotic-Resistant Avian Pathogenic Escherichia coli and Enterotoxigenic Escherichia coli. Intervirology 2015; 58:218-31. [PMID: 26337345 DOI: 10.1159/000437426] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 07/05/2015] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVES To characterize the lytic coliphage vB_EcoM_JS09 (phage JS09) isolated from sewage samples of a swine farm in Jiangsu Province, China, which infects antibiotic-resistant avian pathogenic Escherichia coli (APEC) and enterotoxigenic E. coli (ETEC). METHODS AND RESULTS Transmission electron microscopy revealed that phage JS09 has an isometric icosahedral head (76 nm in diameter) and a long contractile tail (140 nm in length) and features a T-even morphology. Its latent period was 30 min and the average burst size was 79 phage particles per infected cell. It attached to the host cells within 9 min. JS09 could infect 16 clinically isolated APEC and ETEC strains and the laboratory-engineered E. coli K and B strains. Ten of the clinical isolates of E. coli were resistant to antibiotics. At a multiplicity of infection of 10, 3, 1, or 0.3, the phage caused rapid cell lysis within 2 h, resulting in 5- to 10-fold reductions in cell concentration. Sequencing of the JS09 genome revealed a 169.148-kb linear but circularly permuted and terminally redundant dsDNA with 37.98% G+C content. Two hundred seventy-three open reading frames were predicted to be coding sequences, 135 of which were functionally defined and organized in a modular format which includes modules for DNA replication, DNA packaging, structural proteins, and host cell lysis proteins. Phage JS09 is assigned to the Caudovirales order (Myoviridae phage family), and it is considered a T4-like phage based on its morphological, genomic, and growth characteristics. JS09 gp37, a receptor-binding protein (RBP) important for host cell infection, shares little homology with other RBP in the NCBI database, which suggests that the variable regions in gp37 determine the unique host range of phage JS09. Protein sequence comparisons cluster the putative 'RBP' of JS09 much more closely with those of Yersinia phage phiD1, phage TuIa, and phage TuIb. CONCLUSIONS A novel lytic coliphage named JS09 was isolated from sewage samples of a swine farm in Jiangsu Province, China. It could infect antibiotic-resistant APEC and ETEC. The morphological, genomic, and growth characteristics of JS09 were studied, and this will be helpful for phage therapy in controlling diseases caused by APEC and ETEC.
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Affiliation(s)
- Yan Zhou
- Key Lab of Agro-Food Safety and Quality Ministry of Agriculture, and Key Lab of Animal-Derived Food Safety of Jiangsu Province, Jiangsu Academy of Agricultural Sciences, Nanjing, China
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Bio-Control of Salmonella Enteritidis in Foods Using Bacteriophages. Viruses 2015; 7:4836-53. [PMID: 26305252 PMCID: PMC4576208 DOI: 10.3390/v7082847] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 08/07/2015] [Accepted: 08/17/2015] [Indexed: 12/20/2022] Open
Abstract
Two lytic phages, vB_SenM-PA13076 (PA13076) and vB_SenM-PC2184 (PC2184), were isolated from chicken sewage and characterized with host strains Salmonella Enteritidis (SE) ATCC13076 and CVCC2184, respectively. Transmission electron microscopy revealed that they belonged to the family Myoviridae. The lytic abilities of these two phages in liquid culture showed 104 multiplicity of infection (MOI) was the best in inhibiting bacteria, with PC2184 exhibiting more activity than PA13076. The two phages exhibited broad host range within the genus Salmonella. Phage PA13076 and PC2184 had a lytic effect on 222 (71.4%) and 298 (95.8%) of the 311 epidemic Salmonella isolates, respectively. We tested the effectiveness of phage PA13076 and PC2184 as well as a cocktail combination of both in three different foods (chicken breast, pasteurized whole milk and Chinese cabbage) contaminated with SE. Samples were spiked with 1 × 10(4) CFU individual SE or a mixture of strains (ATCC13076 and CVCC2184), then treated with 1 × 10(8) PFU individual phage or a two phage cocktail, and incubated at 4 °C or 25 °C for 5 h. In general, the inhibitory effect of phage and phage cocktail was better at 4 °C than that at 25 °C, whereas the opposite result was observed in Chinese cabbage, and phage cocktail was better than either single phage. A significant reduction in bacterial numbers (1.5-4 log CFU/sample, p < 0.05) was observed in all tested foods. The two phages on the three food samples were relatively stable, especially at 4 ºC, with the phages exhibiting the greatest stability in milk. Our research shows that our phages have potential effectiveness as a bio-control agent of Salmonella in foods.
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Lu Z, Breidt F. Escherichia coli O157:H7 bacteriophage Φ241 isolated from an industrial cucumber fermentation at high acidity and salinity. Front Microbiol 2015; 6:67. [PMID: 25741324 PMCID: PMC4330901 DOI: 10.3389/fmicb.2015.00067] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 01/20/2015] [Indexed: 12/16/2022] Open
Abstract
A novel phage, Φ241, specific for Escherichia coli O157:H7 was isolated from an industrial cucumber fermentation where both acidity (pH ≤ 3.7) and salinity (≥5% NaCl) were high. The phage belongs to the Myoviridae family. Its latent period was 15 min and average burst size was 53 phage particles per infected cell. The phage was able to lyse 48 E. coli O157:H7 strains, but none of the 18 non-O157 strains (including E. coli O104:H7) or the 2 O antigen-negative mutants of O157:H7 strain, 43895Δper (also lacking H7 antigen) and F12 (still expressing H7 antigen). However, the phage was able to lyse a per-complemented strain (43895ΔperComp) which expresses O157 antigen. These results indicated that phage Φ241 is specific for O157 antigen, and E. coli strains lacking O157 antigen were resistant to the phage infection, regardless of the presence or absence of H7 antigen. SDS-PAGE profile revealed at least 13 structural proteins of the phage. The phage DNA was resistant to many commonly used restriction endonucleases, suggesting the presence of modified nucleotides in the phage genome. At the multiplicity of infection of 10, 3, or 0.3, the phage caused a rapid cell lysis within 1 or 2 h, resulting in 3.5- or 4.5-log-unit reduction in cell concentration. The high lytic activity, specificity and tolerance to low pH and high salinity make phage Φ241 a potentially ideal biocontrol agent of E. coli O157:H7 in various foods. To our knowledge, this is the first report on E. coli O157:H7 phage isolated from high acidity and salinity environment.
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Affiliation(s)
- Zhongjing Lu
- Department of Molecular and Cellular Biology, Kennesaw State UniversityKennesaw, GA, USA
| | - Fred Breidt
- USDA Agricultural Research Service – Department of Food, Bioprocessing, and Nutrition Sciences, North Carolina State UniversityRaleigh, NC, USA
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Salem M, Virtanen S, Korkeala H, Skurnik M. Isolation and characterization of Yersinia-specific bacteriophages from pig stools in Finland. J Appl Microbiol 2015; 118:599-608. [PMID: 25495090 DOI: 10.1111/jam.12722] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 11/13/2014] [Accepted: 12/07/2014] [Indexed: 11/26/2022]
Abstract
AIMS Bacteriophages infect bacteria, and they are present everywhere in the world including the intestinal tracts of animals. Yersiniosis is a common foodborne infection caused by Yersinia enterocolitica and Yersinia pseudotuberculosis. As these bacteria are frequently isolated from pigs, we wanted to know whether Yersinia-specific bacteriophages are also present in the pig stools and, if so, whether there is a positive or negative association between the prevalence of the Yersinia phages and the pathogenic Yersinia in the stool samples. METHODS AND RESULTS Altogether 793 pig stool samples collected between November 2010 and March 2012 from 14 Finnish pig farms were screened for the presence of bacteriophages able to infect Y. enterocolitica serotype O:3, O:5,27 or O:9 strains, or Y. pseudotuberculosis serotype O:1a, O:1b or O:3 strains. Yersinia phages were isolated from 90 samples from eight farms. Yersinia enterocolitica O:3 was infected by 59 phages, 28 phages infected serotypes O:3 and O:5,27, and eight phages infected serotypes O:3, O:5,27 and O:9, and Y. pseudotuberculosis O:1a by eight phages. Many phages originating from pigs in the same farm were identical based on their restriction enzyme digestion patterns; 20 clearly different phages were selected for further characterization. Host ranges of these phages were tested with 94 Yersinia strains. Six of the phages infected eight strains, 13 phages infected three strains, and one phage infected only one strain, indicating that the phages had a relatively narrow host range. CONCLUSIONS There was a clear association between the presence of the host bacteria and specific phages in the stools. SIGNIFICANCE AND IMPACT OF THE STUDY The isolated bacteriophages may have potential as biocontrol agents for yersiniosis in both humans and pigs in future, and as alternatives or in addition to antibiotics. To our knowledge, this is the first reported isolation of Yersinia-specific phages from pig stool samples.
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Affiliation(s)
- M Salem
- Department of Bacteriology and Immunology, Haartman Institute, Research Programs Unit, Immunobiology, University of Helsinki, Helsinki, Finland; Department of Microbiology, Faculty of Medicine, University of Benghazi, Benghazi, Libya
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